Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
These heads again cover all cases in the courts, whether we regard them from the point of view of rational or legal questions. For no legal problem can be settled save by the aid of definition, quality and conjecture.
Those, however, who are engaged in instructing the ignorant will find it useful at first to adopt a slightly less rigid method: the road will not be absolutely straight to begin with, but it will be more open and will provide easier going. I would have them therefore learn above all things
Hence arise those questions of legal action or competence. For there are some things, which, although not laudable in themselves, are yet permitted by law; witness the passage in the Twelve Tables authorising creditors to divide up a debtor's body amongst themselves, a law which is repudiated by public custom. There are also certain things which although equitable are prohibited by law; witness the restrictions placed on testamentary disposition. [*]( e.g. that the legal heir must receive at least a quarter of the property. )
The accuser likewise has four things which he must keep in mind: he must prove that something was done, that a particular act was done, that it was wrongly done, and that he brings his charge according to law. Thus every cause will turn on the same sorts of questions, though the parts of plaintiff and defendant will sometimes be interchanged: for instance in the case of a claim for a reward, it will be the plaintiffs task to show that what was done was right.
These four schemes or forms of action which I then called general bases fall into two classes as I have
Legal questions necessarily have a larger number of species, since there are many laws and a variety of forms. In the case of one law we rely on the letter, in others on the spirit. Some laws we force to serve our turn, when we can find no law to support our case, others we compare with one another, and on others we put some novel interpretation.
Thus from these three bases we get three resemblances of bases: sometimes simple, sometimes complex, but all having a character of their own, as, for instance, when questions of the letter of the law and its intention are involved, for these clearly come under conjecture or quality; or again where the syllogism is involved, for this is specially connected with quality; or where contradictory laws are involved, for these are on the same footing as the letter of the law and intention; or yet again in cases of ambiguity, which is always resolved by conjecture.